The Hidden Entry Points Builders Leave Behind That Attract Rodents and How to Fix Them

Rodents like rats and mice are experts at finding their way into homes through the smallest openings. Builders often unintentionally leave behind entry points during construction or renovation that become easy access routes for these pests. If you live in Tavistock, Yelverton, or anywhere across Devon, understanding these hidden gaps is crucial to protecting your property from unwanted rodent visitors.

How Small Gaps Become Big Problems

Rats and mice do not need large holes to enter a building. Mice can squeeze through gaps as small as 6 to 10 millimetres, roughly the size of a pencil or a dime. Rats require larger openings, about 12 to 20 millimetres, but they are strong and can gnaw to widen holes if needed.

Common entry points left behind by builders include:

• Removed pipes: When plumbing or heating pipes are taken out, the holes they leave behind are often not sealed properly.

• Old vents: Vents that are no longer in use but remain open provide direct access.

• Gaps around cables: Electrical or communication cables passing through walls or floors often leave unsealed gaps.

• Unsealed holes in walls: Any holes drilled for fixtures or maintenance that are not filled or sealed.

  
  

These openings create a welcome invitation for rodents to enter and establish nests inside walls, under floors, or in loft spaces.

Real-World Examples of Rodent Entry Points

In one case in Devon, a homeowner noticed gnaw marks near a small hole left after a water pipe was removed. The hole was only 8 millimetres wide, but it allowed mice to enter the property. The mice left droppings in the kitchen cupboards and caused damage to food packaging.

Another example involved a landlord in Tavistock who found rats entering through an old vent that had been sealed improperly. The vent opening was about 25 millimetres wide, perfect for rats to squeeze through. The rats caused damage to insulation and wiring in the loft.

These examples show how even small or overlooked gaps can lead to significant rodent problems.

Signs of Rodent Activity to Watch For

Detecting rodent presence early can save you from costly damage and health risks. Look out for these signs:

• Smear marks: Rodents leave greasy, dark marks along walls or entry points where they repeatedly travel.

• Gnawing damage: Chewed holes in wood, plastic, or wiring indicate rodent activity.

• Droppings: Small, dark droppings near food sources, cupboards, or hidden corners.

• Scratching noises: Sounds coming from walls or ceilings, especially at night.

• Nests: Shredded paper, fabric, or insulation materials gathered in hidden spots.

  
  

If you notice any of these signs, it is important to act quickly to prevent infestation.

Small gap around removed pipe in wall allowing rodent entry

Why Proper Proofing After Building Work Matters

After any building or renovation work, proofing your property against rodents is essential. This means:

• Sealing all holes and gaps left by removed pipes, cables, or vents.

• Using rodent-proof materials such as metal mesh or cement to close openings.

• Checking that doors, windows, and vents have tight-fitting screens or seals.

• Inspecting lofts, basements, and crawl spaces for any unsealed access points.

  
  

Proper proofing not only keeps rodents out but also improves insulation and energy efficiency.

The Importance of Professional Pest Control Inspection

Even with careful proofing, some entry points can be hard to spot. Professional pest control experts have the experience and tools to:

• Identify hidden gaps and weak spots in your property.

• Detect early signs of rodent activity that may go unnoticed.

• Recommend effective sealing and proofing solutions.

• Provide ongoing monitoring and advice to keep your home rodent-free.

  
  

For homeowners and landlords in Devon, booking a professional survey with Dartmoor Pest Control ensures your property is secure against rodents.

Take Action to Protect Your Home Today

Rodents can cause serious damage and health risks if they gain access to your property. Builders’ leftover gaps are often the easiest way for them to enter. By understanding these hidden entry points and taking steps to seal them, you can protect your home or rental property.